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Related Experiment Videos

Visual acuity, color vision, and visual search performance at sea

D C Donderi1

  • 1Department of Psychology, McGill University, Montreal, PQ, Canada.

Human Factors
|March 1, 1994
PubMed
Summary

Visual acuity and color vision significantly impact daytime sea search and rescue performance. Selective screening for these abilities could enhance daylight detection efficiency by over 10%.

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Area of Science:

  • Maritime safety
  • Human factors in search and rescue
  • Ophthalmology

Background:

  • Effective search and rescue (SAR) at sea relies on visual capabilities of watchkeepers.
  • Assessing the impact of visual acuity and color vision on SAR performance is crucial for optimizing operational efficiency.

Purpose of the Study:

  • To evaluate the correlation between visual acuity, color vision, and the performance of watchkeepers during a simulated maritime search and rescue exercise.
  • To determine the potential efficiency gains from implementing selective screening for visual acuity and color vision.

Main Methods:

  • Fifty-seven watchkeepers participated in a sea-based SAR exercise, searching for life rafts under various conditions (daylight, night with night vision goggles).
  • Visual acuity and color vision tests (Dvorine pseudoisochromatic plates, Farnsworth color test) were administered.
  • Environmental factors (wind, waves, weather) were recorded as covariates.

Main Results:

  • Daytime detection performance positively correlated with low-contrast visual acuity and negatively with color vision test errors.
  • Watchkeeper performance was superior during the initial 30 minutes of a one-hour watch.
  • No significant relationship was found between visual acuity or color vision and life raft detection using night vision goggles.

Conclusions:

  • Visual acuity and color vision are critical for effective daylight maritime search and rescue.
  • Implementing selective screening for visual acuity (12% improvement) and color vision (10% improvement) could significantly enhance daylight search performance.
  • Night vision goggle performance in SAR is not directly correlated with standard visual acuity or color vision tests.

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